Injector



J. JENKS 8a T. J.' HART.

(Model.)

INJEGTOR., y

Patented Aug. 10, 1886.

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f UNITED YSTATES PATENT OFFICE.;

JAMES JENKS AND THOMAS J. HART, OF DETROlT, MICHIGAN.

INJECTOR.

SPECIFICATION forming pari'. of Letters Patent No. 347,245,6ated August l0, 1886.

(Model.)

To LZZ whom, it may concern.-

Be it known that we, JAMES JENKs and THOMAS J. HART, citizensortheunned stares,

4 ing specification.

. arranged in reference to the opening from the` This invention relates to that class of feedwater injectors for feeding boilers that have an automatic relief valve or valves, and particularly to the manner of operating the same, which will be more readily understood from the following description, and the drawings which form a part thereo Figure 1 is a longitudinal central section. Fig. 2 is a cross-section at the line X X. Fig. 3shows an internal elevation of the overflowpipe, showing especially the ports opening into it. Fig. 4. shows a modified form of our invention.

Fig. 1 shows the form of injector to which we apply our improvement; and it consists of a steam-nozzle, S, discharge-tube C, an intermediate tube, I, between the steamnozzle S and tube C, said intermediate tube being tted closely within or made in one piece with the surroundingbody of the injector, a diaphram surrounding the tube C, and between it and the body of the injector, the delivery/tube D, the steam-chamber t, water or suction chamber w, and relief-.chambers a and m. An upright overflowpipe, O, is connected with the body of the injector, and has iitted to the interior a plug or slide valve, V. Across the bottom of the overtlcw-pipe isa diaphragm, p, closing direct communication with the interior of the injector. In the side of the overflow/pipe is a port communicating by the passage K with the chamber a, and is chamber m,so that the port leading to the passage K will be closed by the valveV before the port to the passage g shall be entirely closed. This result is attained by making the port to the passage K with its lowest point some distance above 'the diaphragm p across the bottom of the overflow-pipe, while the port to the passage g has its lowest point coincident with the bottom, or at least below the lowest point to which the valve V is allowed to descend. Close contact between the lower surface of the valve V and the diaphragm p is prevented by a suitable projection on one of the surfaces, or by any equivalent which will keep the two surfaces sufficiently apart to allow steam rfrom the passage g to enter between the two and raise the valve. An es` cape-pipe, r, (shown by Fig. 2,) allows the surplus water to pass away. y

We prefer to make the relative position of the two ports as specifically described-that is, so that the eXtreme lower part of the port from the passage K will be somewhat below the extreme lower part or" the port from the passage g, inasmuch as when working with a low pressure of steam much better results are obtained than when the ports are closed simultaneously. With a'high pressure the result ot' a difference of elevation of the lower extremity of the ports is not so noticeable.

A modified form ot our invention is shown in Fig. 4., in which the passageg has its opening through the diaphragm p, instead of into the side of the overllow-pipe.

It will be seen that our invention consists in so arranging the ports leading. from the chambers n and m that they can be closed successively by a single slide-valve, V.

Having thus described our invention, what we claim as novel, and desire to have secured to us by Letters Patent, is-

1. In an injector, the combination of atube C, having a diaphragm surrounding it, and interposed between it and the surrounding body of the injector, and an overflow-pipe having two inlet-ports, one of which communicates with the space at the side of said diaphragm vnearest the delivery tube, and the other of which communicates with the space at the opposite side,with a valve to close the ports, the said inlet-ports being so arranged with respect to each other that the one communicating with the space at the side of said diaphragm nearest the delivery-tube shall remain open or partially open for a period of time after the other opening shall have been fully eloosed by the valve. Y y

2. An injector having a steam nozzle, an intermediate tube between said nozzle and the discharge-tube, thesaid intermediate tube being fitted closely within or made in one IOO piece with the surrounding body of the inrespect to the other as to be entirely closed by ro jector, @discharge-tube having a diaphragm said valve, While the other reinainsopcn or surrounding it and interposed between it and partially open. the body 0i' the injector, the spaces formed 5 by said diaphragm, the discharge-tube, and

the body of the injector being both in coinmunication with thc overflowpipe by means In presence 0fof ports closed by a valve in said overflow- CHARLEs F. BURTON, pipe, one of which ports is so situated with MILTON T. DUNCANSON.

JAMES JENKS. THOMAS J. HART. 

